Jill Asks Jack to Give Her an Estimate in the Price

Jill asks Jack to give her an estimate in the price of building a fence around her orchard.Jack inspects and measures Jill's apple orchard and gives Jill an estimate of $1,000.Jill agrees to the price and they sign a contract.Jill,however,had in mind a fence around her peach orchard that is much larger than the apple orchard on which Jack based his estimate.Jack says he cannot build a fence around the peach orchard for $1,000,but Jill wants to hold Jack to the $1,000 for a fence around the peach orchard.Which of the following statements best describes this situation?

A) This is a case of mutual mistake.
B) This is a case of unilateral mistake.
C) This is a case of innocent misrepresentation.
D) This is a case of fraud.